Hitachi CS30EH - Инструкция по эксплуатации - Страница 10

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Never saw completely through the trunk. Always 
leave a hinge.
The hinge guides the tree. If the trunk is 
completely cut through, you lose control over 
the felling direction.
Insert a wedge or a felling lever in the cut well 
before the tree becomes unstable and starts to 
move. This will prevent the guide bar from 
binding in the felling cut if you have misjudged 
the falling direction. Make sure no people have 
come into the range of the falling tree before 
you push it over.

FELLING CUT, TRUNK DIAMETER MORE 
THAN TWICE GUIDE BAR LENGTH
Cut a large, wide notch. Then cut a recess into 
the center of the notch. Always leave a hinge 
on both sides of the center cut. (Fig. 2-7E) 

Complete the felling cut by sawing around the 
trunk as in the Fig. 2-7F.

      WARNINGI
These methods are extremely dangerous 
because they involve the use of the nose of 
guide bar and can result in kickback. Only 
properly trained professionals should attempt 
these techniques.

Fig. 2-7B

Fig. 2-7C

Fig. 2-7D

Fig. 2-7F

Fig. 2-7E

WARNING!

Never use the saw with only one hand. 
You cannot control the saw properly and 
you may lose control and injure yourself 
severely.
Keep the saw body close to your body to 
improve control and reduce strain.
When cutting with the bottom part of the 
chain the reactive force will pull the saw 
away from you towards the wood you are 
cutting.
The saw will control the feeding speed 
and sawdust will be directed towards you. 
(Fig. 2-7B)

When cutting with the upper part of the 
chain the reactive force will push the saw 
towards you and away from the wood you 
are cutting. (Fig. 2-7C)

      WARNING!
There is a risk of kickback if the saw is 
pushed far enough so that you begin to cut 
with the nose of the bar.
The safest cutting method is to cut with the 
bottom part of the chain. Sawing with the 
upper part makes it much more difficult to 
control the saw and increases the risk of 
kickback.

NOTE!
Always keep the spiked bumper face to a tree, 
because the chain may suddenly be drawn into 
a tree.

FELLING
Felling is more than cutting down a tree. You 
must also bring it down as near to an intended 
place as possible without damaging the tree or 
anything else.
Before felling a tree, carefully consider all 
conditions which may effect the intended 
direction, such as:
Angle of the tree. Shape of the crown. Snow 
load on the crown. Wind conditions. Obstacles 
within tree range (e.g., other trees, power lines, 
roads, buildings, etc.).

      WARNING!
Always observe the general conditions of 
the tree. Look for decay and rot in the trunk 
which will make it more likely to snap and 
start to fall before you expect it.
Look for dry branches, which may break and 
hit you when you are working.
Always keep animals and people at least 
twice the tree length away while felling. 
Clear away shrubs and branches from 
around the tree.
Prepare a path of retreat away from the 
felling direction.

BASIC RULES FOR FELLING TREES 
Normally the felling consists of two main 
cutting operations, notching and making the 
felling cut.
Start making the upper notch cut on the side of 
the tree facing the feeling direction. Look 
through the kerf as you saw the lower cut so 
you do not saw too deep into the trunk.
The notch should be deep enough to create a 
hinge of sufficient width and strength. The 
notch opening should be wide enough to direct 
the fall of the tree as long as possible.
Saw the felling cut from the other side of the 
tree between one and two inches (3-5 cm) 
above the edge of the notch. (Fig. 2-7D)

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Fig.2-6